Question: Which is the city of the twinned administrative body of Thessaloniki?
Paraphrase: Which is the city of the twinned regulatory body of Thessaloniki?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P190 wd:Q17151 . ?sbj wdt:P31 wd:Q515 } 
Answer: Constanța, Durrës, Korçë, Amasya, City of Melbourne, Venice, Bratislava, Bologna, Leipzig, Tirana, San Francisco, Tel Aviv